Workaround: The length of the string exceeds the value set on the maxJsonLength property in SharePoint 2013 list forms

I was getting this error when I opened a SharePoint list display/New forms. The error appears when I was doing load/scalability testing of SharePoint list with lot of data. The main list has couple of lookup columns. The size of lookup lists was big (around 20K items in each list which was referenced as lookup

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